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Electrocatalytic Nanostructured Ferric Tannates: Characterization and Application of a Polyphenol Nanosensor
Author(s) -
Magro Massimiliano,
Bonaiuto Emanuela,
Baratella Davide,
de Almeida Roger Jessica,
Jakubec Petr,
Corraducci Vittorino,
Tuček Jiri,
Malina Ondrej,
Zbořil Radek,
Vianello Fabio
Publication year - 2016
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201600718
Subject(s) - maghemite , cyclic voltammetry , chronoamperometry , nanomaterials , ferric , chemistry , nanoparticle , inorganic chemistry , dielectric spectroscopy , voltammetry , nuclear chemistry , chemical engineering , materials science , nanotechnology , electrochemistry , electrode , engineering
A novel core–shell hybrid nanomaterial composed of peculiar maghemite nanoparticles (surface‐active maghemite nanoparticles (SAMNs)) as the core and tannic acid (TA) as the shell was developed by self‐assembly of ferric tannates onto the surface of SAMNs by simple incubation in water. The hybrid nanomaterial (SAMN@TA) was characterized by using UV/Vis, FTIR, and Mössbauer spectroscopies, magnetization measurements, and X‐ray powder diffraction, which provide evidence of a drastic reorganization of the iron oxide surface upon reaction with TA and the formation of an outer shell that consists of a cross‐linked network of ferric tannates. According to a Langmuir isotherm analysis, SAMN@TA offers one of most stable iron complexes of TA reported in the literature to date. Moreover, SAMN@TA was characterized by using electrical impedance spectroscopy, voltammetry, and chronoamperometry. The nanostructured ferric tannate interface showed improved conductivity and selective electrocatalytic activity toward the oxidation of polyphenols. Finally, a carbon‐paste electrode modified with SAMN@TA was used for the determination of polyphenols in blueberry extracts by square‐wave voltammetry.